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For those who don't know, the Tendo is a device which you can use to measure the peak/avg. velocity of your lifts. I've always wanted one, but at $1600 (http://store.sorinex.com/Tendo-Weightlifting-Analyzer-p/t-2.htm) it was way out of my price range.
What is a peak flow meter? A peak flow meter is a small device that you blow into. It measures the fastest rate of air (airflow) that you can blow out of your lungs. It records airflow in litres per minute (L/min). Your doctor may prescribe a peak flow meter for you if you have asthma. There are different brands of peak flow meter.